<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------


/**
 * 日期时间操作类
 * @category   ORG
 * @package  ORG
 * @subpackage  Date
 * @author    liu21st <liu21st@gmail.com>
 * @version   $Id: Date.class.php 2662 2012-01-26 06:32:50Z liu21st $
 */
class Date {

	/**
	 * 日期的时间戳
	 * @var integer
	 * @access protected
	 */
	protected $date;

	/**
	 * 时区
	 * @var integer
	 * @access protected
	 */
	protected $timezone;

	/**
	 * 年
	 * @var integer
	 * @access protected
	 */
	protected $year;

	/**
	 * 月
	 * @var integer
	 * @access protected
	 */
	protected $month;

	/**
	 * 日
	 * @var integer
	 * @access protected
	 */
	protected $day;

	/**
	 * 时
	 * @var integer
	 * @access protected
	 */
	protected $hour;

	/**
	 * 分
	 * @var integer
	 * @access protected
	 */
	protected $minute;

	/**
	 * 秒
	 * @var integer
	 * @access protected
	 */
	protected $second;

	/**
	 * 星期的数字表示
	 * @var integer
	 * @access protected
	 */
	protected $weekday;

	/**
	 * 星期的完整表示
	 * @var string
	 * @access protected
	 */
	protected $cWeekday;

	/**
	 * 一年中的天数 0－365
	 * @var integer
	 * @access protected
	 */
	protected $yDay;

	/**
	 * 月份的完整表示
	 * @var string
	 * @access protected
	 */
	protected $cMonth;

	/**
	 * 日期CDATE表示
	 * @var string
	 * @access protected
	 */
	protected $CDATE;

	/**
	 * 日期的YMD表示
	 * @var string
	 * @access protected
	 */
	protected $YMD;

	/**
	 * 时间的输出表示
	 * @var string
	 * @access protected
	 */
	protected $CTIME;

	// 星期的输出
	protected $Week = array("日","一","二","三","四","五","六");

	/**
	 * 架构函数
	 * 创建一个Date对象
	 * @param mixed $date  日期
	 * @static
	 * @access public
	 */
	public function __construct($date='') {
		//分析日期
		$this->date =   $this->parse($date);
		$this->setDate($this->date);
	}

	/**
	 * 日期分析
	 * 返回时间戳
	 * @static
	 * @access public
	 * @param mixed $date 日期
	 * @return string
	 */
	public function parse($date) {
		if (is_string($date)) {
			if (($date == "") || strtotime($date) == -1) {
				//为空默认取得当前时间戳
				$tmpdate = time();
			} else {
				//把字符串转换成UNIX时间戳
				$tmpdate = strtotime($date);
			}
		} elseif (is_null($date))  {
			//为空默认取得当前时间戳
			$tmpdate = time();

		} elseif (is_numeric($date)) {
			//数字格式直接转换为时间戳
			$tmpdate = $date;

		} else {
			if (get_class($date) == "Date") {
				//如果是Date对象
				$tmpdate = $date->date;
			} else {
				//默认取当前时间戳
				$tmpdate = time();
			}
		}
		return $tmpdate;
	}

	/**
	 * 验证日期数据是否有效
	 * @access public
	 * @param mixed $date 日期数据
	 * @return string
	 */
	public function valid($date) {

	}

	/**
	 * 日期参数设置
	 * @static
	 * @access public
	 * @param integer $date  日期时间戳
	 * @return void
	 */
	public function setDate($date) {
		$dateArray  =   getdate($date);
		$this->date         =   $dateArray[0];            //时间戳
		$this->second       =   $dateArray["seconds"];    //秒
		$this->minute       =   $dateArray["minutes"];    //分
		$this->hour         =   $dateArray["hours"];      //时
		$this->day          =   $dateArray["mday"];       //日
		$this->month        =   $dateArray["mon"];        //月
		$this->year         =   $dateArray["year"];       //年

		$this->weekday      =   $dateArray["wday"];       //星期 0～6
		$this->cWeekday     =   '星期'.$this->Week[$this->weekday];//$dateArray["weekday"];    //星期完整表示
		$this->yDay         =   $dateArray["yday"];       //一年中的天数 0－365
		$this->cMonth       =   $dateArray["month"];      //月份的完整表示

		$this->CDATE        =   $this->format("%Y-%m-%d");//日期表示
		$this->YMD          =   $this->format("%Y%m%d");  //简单日期
		$this->CTIME        =   $this->format("%H:%M:%S");//时间表示

		return ;
	}

	/**
	 * 日期格式化
	 * 默认返回 1970-01-01 11:30:45 格式
	 * @access public
	 * @param string $format  格式化参数
	 * @return string
	 */
	public function format($format = "%Y-%m-%d %H:%M:%S") {
		return strftime($format, $this->date);
	}

	/**
	 * 是否为闰年
	 * @static
	 * @access public
	 * @return string
	 */
	public function isLeapYear($year='') {
		if(empty($year)) {
			$year = $this->year;
		}
		return ((($year % 4) == 0) && (($year % 100) != 0) || (($year % 400) == 0));
	}

	/**
	 * 计算日期差
	 *
	 *  w - weeks
	 *  d - days
	 *  h - hours
	 *  m - minutes
	 *  s - seconds
	 * @static
	 * @access public
	 * @param mixed $date 要比较的日期
	 * @param string $elaps  比较跨度
	 * @return integer
	 */
	public function dateDiff($date, $elaps = "d") {
		$__DAYS_PER_WEEK__       = (7);
		$__DAYS_PER_MONTH__       = (30);
		$__DAYS_PER_YEAR__       = (365);
		$__HOURS_IN_A_DAY__      = (24);
		$__MINUTES_IN_A_DAY__    = (1440);
		$__SECONDS_IN_A_DAY__    = (86400);
		//计算天数差
		$__DAYSELAPS = ($this->parse($date) - $this->date) / $__SECONDS_IN_A_DAY__ ;
		switch ($elaps) {
			case "y"://转换成年
				$__DAYSELAPS =  $__DAYSELAPS / $__DAYS_PER_YEAR__;
				break;
			case "M"://转换成月
				$__DAYSELAPS =  $__DAYSELAPS / $__DAYS_PER_MONTH__;
				break;
			case "w"://转换成星期
				$__DAYSELAPS =  $__DAYSELAPS / $__DAYS_PER_WEEK__;
				break;
			case "h"://转换成小时
				$__DAYSELAPS =  $__DAYSELAPS * $__HOURS_IN_A_DAY__;
				break;
			case "m"://转换成分钟
				$__DAYSELAPS =  $__DAYSELAPS * $__MINUTES_IN_A_DAY__;
				break;
			case "s"://转换成秒
				$__DAYSELAPS =  $__DAYSELAPS * $__SECONDS_IN_A_DAY__;
				break;
		}
		return $__DAYSELAPS;
	}

	/**
	 * 人性化的计算日期差
	 * @static
	 * @access public
	 * @param mixed $time 要比较的时间
	 * @param mixed $precision 返回的精度
	 * @return string
	 */
	public function timeDiff( $time ,$precision=false) {
		if(!is_numeric($precision) && !is_bool($precision)) {
			static $_diff = array('y'=>'年','M'=>'个月','d'=>'天','w'=>'周','s'=>'秒','h'=>'小时','m'=>'分钟');
			return ceil($this->dateDiff($time,$precision)).$_diff[$precision].'前';
		}
		$diff = abs($this->parse($time) - $this->date);
		static $chunks = array(array(31536000,'年'),array(2592000,'个月'),array(604800,'周'),array(86400,'天'),array(3600 ,'小时'),array(60,'分钟'),array(1,'秒'));
		$count =0;
		$since = '';
		for($i=0;$i<count($chunks);$i++) {
			if($diff>=$chunks[$i][0]) {
				$num   =  floor($diff/$chunks[$i][0]);
				$since .= sprintf('%d'.$chunks[$i][1],$num);
				$diff =  (int)($diff-$chunks[$i][0]*$num);
				$count++;
				if(!$precision || $count>=$precision) {
					break;
				}
			}
		}
		return $since.'前';
	}

	/**
	 * 返回周的某一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function getDayOfWeek($n){
		$week = array(0=>'sunday',1=>'monday',2=>'tuesday',3=>'wednesday',4=>'thursday',5=>'friday',6=>'saturday');
		return (new Date($week[$n]));
	}

	/**
	 * 计算周的第一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function firstDayOfWeek() {
		return $this->getDayOfWeek(1);
	}

	/**
	 * 计算月份的第一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function firstDayOfMonth() {
		return (new Date(mktime(0, 0, 0,$this->month,1,$this->year )));
	}

	/**
	 * 计算年份的第一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function firstDayOfYear() {
		return (new Date(mktime(0, 0, 0, 1, 1, $this->year)));
	}

	/**
	 * 计算周的最后一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function lastDayOfWeek() {
		return $this->getDayOfWeek(0);
	}

	/**
	 * 计算月份的最后一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function lastDayOfMonth() {
		return (new Date(mktime(0, 0, 0, $this->month + 1, 0, $this->year )));
	}

	/**
	 * 计算年份的最后一天 返回Date对象
	 * @access public
	 * @return Date
	 */
	public function lastDayOfYear() {
		return (new Date(mktime(0, 0, 0, 1, 0, $this->year + 1)));
	}

	/**
	 * 计算月份的最大天数
	 * @access public
	 * @return integer
	 */
	public function maxDayOfMonth() {
		$result = $this->dateDiff(strtotime($this->dateAdd(1,'m')),'d');
		return $result;
	}

	/**
	 * 取得指定间隔日期
	 *
	 *    yyyy - 年
	 *    q    - 季度
	 *    m    - 月
	 *    y    - day of year
	 *    d    - 日
	 *    w    - 周
	 *    ww   - week of year
	 *    h    - 小时
	 *    n    - 分钟
	 *    s    - 秒
	 * @access public
	 * @param integer $number 间隔数目
	 * @param string $interval  比较类型
	 * @return Date
	 */
	public function dateAdd($number = 0, $interval = "d") {
		$hours =  $this->hour;
		$minutes =  $this->minute;
		$seconds =  $this->second;
		$month =  $this->month;
		$day =  $this->day;
		$year =  $this->year;

		switch ($interval) {
			case "yyyy":
				//---Add $number to year
				$year += $number;
				break;

			case "q":
				//---Add $number to quarter
				$month += ($number*3);
				break;

			case "m":
				//---Add $number to month
				$month += $number;
				break;

			case "y":
			case "d":
			case "w":
				//---Add $number to day of year, day, day of week
				$day += $number;
				break;

			case "ww":
				//---Add $number to week
				$day += ($number*7);
				break;

			case "h":
				//---Add $number to hours
				$hours += $number;
				break;

			case "n":
				//---Add $number to minutes
				$minutes += $number;
				break;

			case "s":
				//---Add $number to seconds
				$seconds += $number;
				break;
		}

		return (new Date(mktime($hours,
		$minutes,
		$seconds,
		$month,
		$day,
		$year)));

	}

	/**
	 * 日期数字转中文
	 * 用于日和月、周
	 * @static
	 * @access public
	 * @param integer $number 日期数字
	 * @return string
	 */
	public function  numberToCh($number) {
		$number = intval($number);
		$array  = array('一','二','三','四','五','六','七','八','九','十');
		$str = '';
		if($number  ==0)  { $str .= "十" ;}
		if($number  <  10){
			$str .= $array[$number-1] ;
		}
		elseif($number  <  20  ){
			$str .= "十".$array[$number-11];
		}
		elseif($number  <  30  ){
			$str .= "二十".$array[$number-21];
		}
		else{
			$str .= "三十".$array[$number-31];
		}
		return $str;
	}

	/**
	 * 年份数字转中文
	 * @static
	 * @access public
	 * @param integer $yearStr 年份数字
	 * @param boolean $flag 是否显示公元
	 * @return string
	 */
	public function  yearToCh( $yearStr ,$flag=false ) {
		$array = array('零','一','二','三','四','五','六','七','八','九');
		$str = $flag? '公元' : '';
		for($i=0;$i<4;$i++){
			$str .= $array[substr($yearStr,$i,1)];
		}
		return $str;
	}

	/**
	 *  判断日期 所属 干支 生肖 星座
	 *  type 参数：XZ 星座 GZ 干支 SX 生肖
	 *
	 * @static
	 * @access public
	 * @param string $type  获取信息类型
	 * @return string
	 */
	public function magicInfo($type) {
		$result = '';
		$m      =   $this->month;
		$y      =   $this->year;
		$d      =   $this->day;

		switch ($type) {
			case 'XZ'://星座
				$XZDict = array('摩羯','宝瓶','双鱼','白羊','金牛','双子','巨蟹','狮子','处女','天秤','天蝎','射手');
				$Zone   = array(1222,122,222,321,421,522,622,722,822,922,1022,1122,1222);
				if((100*$m+$d)>=$Zone[0]||(100*$m+$d)<$Zone[1])
				$i=0;
				else
				for($i=1;$i<12;$i++){
					if((100*$m+$d)>=$Zone[$i]&&(100*$m+$d)<$Zone[$i+1])
					break;
				}
				$result = $XZDict[$i].'座';
				break;

			case 'GZ'://干支
				$GZDict = array(
				array('甲','乙','丙','丁','戊','己','庚','辛','壬','癸'),
				array('子','丑','寅','卯','辰','巳','午','未','申','酉','戌','亥')
				);
				$i= $y -1900+36 ;
				$result = $GZDict[0][$i%10].$GZDict[1][$i%12];
				break;

			case 'SX'://生肖
				$SXDict = array('鼠','牛','虎','兔','龙','蛇','马','羊','猴','鸡','狗','猪');
				$result = $SXDict[($y-4)%12];
				break;

		}
		return $result;
	}

	public function __toString() {
		return $this->format();
	}
}